Google map is a little bit off. Here are some extras details to guide you:

To get by car to Alain-Marie studio & garden you have to take the 117 and turn right on le Chemin de l'Ile (right after Spad Auto). Le 2410 is directly after the first little bridge (almost invisible). You will see sculptures in the garden.

If you walk from the village it is on the left just before the second bridge. There is about 5-10 min walk between the first bridge over the rapids and the second one. About 15-20 min walk from the center of the village depending on your pace...